I'm close to signing a lease for my property in SW Butler County. I requested a top and bottom depth severance. The addendum came back with A top severance of 400' above the tully formation to the surface and the bottom is below the base of the Oriskany formation. What are the approximate depths of these formations in SW Butler County? Also Is the bottom depth deeper than required for the Marcellus? Is the company getting the next gas producing fromation included at this depth?